WO2015034264A1 - Procédé et appareil pour balayer un canal - Google Patents

Procédé et appareil pour balayer un canal Download PDF

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Publication number
WO2015034264A1
WO2015034264A1 PCT/KR2014/008276 KR2014008276W WO2015034264A1 WO 2015034264 A1 WO2015034264 A1 WO 2015034264A1 KR 2014008276 W KR2014008276 W KR 2014008276W WO 2015034264 A1 WO2015034264 A1 WO 2015034264A1
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WO
WIPO (PCT)
Prior art keywords
channel
terminal device
wireless lan
access point
history information
Prior art date
Application number
PCT/KR2014/008276
Other languages
English (en)
Inventor
Ik-Soon Hwang
Dong-Seok Ok
Eun-Woo Lee
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR20130115722A external-priority patent/KR20150026672A/ko
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Publication of WO2015034264A1 publication Critical patent/WO2015034264A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services

Definitions

  • the present invention generally relates to a method and device for determining a channel to be scanned and for scanning the determined channel.
  • a wireless Local Area Network enables data communication using Radio Frequencies (RFs) instead of wires so that terminal devices may wirelessly communicate with each other.
  • RFs Radio Frequencies
  • a terminal device equipped with a WLAN card may access the Internet without being connected to a communication cable within a specific area.
  • the terminal device may be connected to an Access Point (AP) so as to access the Internet through the WLAN.
  • AP Access Point
  • the terminal device needs to efficiently detect an available AP to use the WLAN.
  • the present invention has been made to address at least the above described problems and disadvantages, and to provide at least the advantages described below.
  • an access point connectable to the terminal device 100 or 600 may be rapidly detected.
  • a channel for detecting an access point that is highly possibly connectable to the terminal device 100 or 600 at a current location may be preferentially scanned.
  • FIGs. 1A and 1B are diagrams illustrating a system for performing the channel scanning method according to an embodiment of the present invention
  • FIG. 2 is a flowchart illustrating a method for scanning each channel to be scanned through passive scanning or active scanning, according to an embodiment of the present invention
  • FIGS. 3 and 4 are flowcharts illustrating a method for determining a channel to be scanned and for scanning the determined channel, according to an embodiment of the present invention
  • FIG. 5 is a diagram illustrating an example of wireless LAN connection history information according to an embodiment of the present invention.
  • FIGs. 6A and 6B are blocks diagram illustrating an inner structure of a terminal device for performing a channel scanning method according to an embodiment of the present invention.
  • a method for scanning a channel includes: obtaining wireless LAN connection history information; determining a channel to be scanned based on the wireless LAN connection history information; and scanning a channel based on the determined channel.
  • the obtaining the wireless LAN connection history information may include: obtaining location information on a terminal device; and obtaining wireless LAN connection history information corresponding to the location information.
  • the location information may include at least one of a cell ID of a wireless mobile communication base station connected to a terminal device, a location area code (LAC), a routing area code (RAC), and a tracking area code (TAC) of the wireless mobile communication system connected to the terminal device.
  • LAC location area code
  • RAC routing area code
  • TAC tracking area code
  • the wireless LAN connection history information may include wireless LAN connection history information corresponding to an entire location of a terminal device.
  • the wireless LAN connection history information may include channel information, wherein the channel information may include at least one of the number of times of connection to an arbitrary access point for each channel, a duration time of connection to the arbitrary access point for each channel, and a time of connection to the arbitrary access point for each channel.
  • the scanning the channel may include: scanning a channel able to be scanned by a terminal device; and scanning the channel determined based on the wireless LAN connection history information.
  • the method may further include: determining an access point based on a result of the scanning; performing connection to the determined access point; and updating the wireless LAN connection history information based on information on the access point to which the connection is performed.
  • the wireless LAN connection history information may be updated based on at least one of the number of times of connection to the terminal device for each channel, a duration time of connection to the terminal device for each channel, and a time of connection to the terminal device for each channel.
  • the scanning the channel may include performing at least one of active scanning in which a probe request message is transmitted to the channel to be scanned and a probe response is received and passive scanning in which a beacon signal is received from the channel to be scanned.
  • a terminal device includes: a control unit configured to obtain wireless LAN connection history information, determine a channel to be scanned based on the wireless LAN connection history information, and scan the channel; and a communication unit configured to scan a channel based on the determined channel.
  • ... unit or “module” denotes a unit for processing at least one function or operation, and may be implemented as hardware or software or a combination thereof.
  • FIGS. 1A and 1B are diagrams illustrating systems for performing a method for scanning a channel according to an embodiment of the present invention.
  • the system for performing the channel scanning method includes a terminal device 100 and a wireless LAN environment 200.
  • the terminal device 100 may include various types of devices.
  • the terminal device 100 may include a Personal Computer (PC), a laptop computer, a mobile phone, a tablet PC, a navigation terminal, a smartphone, a Personal Digital Assistant (PDA), a portable multimedia player, and a digital broadcast receiver.
  • PC Personal Computer
  • PDA Personal Digital Assistant
  • the terminal device 100 may include other devices with communication functions which are commercialized at the present time or will be developed.
  • the wireless LAN environment 200 includes at least one access point.
  • the terminal device 100 may be connected to the access point to use Internet service through the wireless LAN.
  • the terminal device 100 determines a channel to be scanned based on wireless LAN connection history information and scans the determined channel to detect an access point that may be connected to the terminal device 100.
  • the terminal device 100 may scan the channel using a passive scanning method or an active scanning method. A channel scanning method will be described in detail with reference to FIG. 2.
  • a channel denotes a frequency band used by each access point to transmit/receive data.
  • a frequency band for wireless data communication may be assigned to each access point.
  • the access point transmits/receives data to/from the terminal device 100 through an assigned channel, i.e. a frequency band.
  • the wireless LAN connection history information includes information on a history of connection between the terminal device 100 and an arbitrary access point.
  • the wireless LAN connection history information may include location information obtained when the terminal device 100 is connected to the access point and information on a channel used by the access point.
  • the channel information may be present for each location information, and may include channel statistics information related to wireless LAN connection for each channel, such as the number of times of successful connection, the duration of connection, and a recent connection time.
  • the terminal device 100 may determine a current location, and may determine a channel to be scanned based on the channel information corresponding to the current location. Therefore, the terminal device 100 may preferentially scan a channel that is highly possibly used by an access point available at the current location, using the channel statistics information.
  • the system for performing the channel scanning method may include the terminal device 100, the wireless LAN environment 200, an external terminal device 310, and an external server 320
  • the external terminal device 310 may be connected to an access point of the wireless environment 200 to use Internet service through the wireless LAN.
  • the terminal device 100 may further consider wireless LAN connection history information of the external terminal device 310 to determine a channel to be scanned. That is, the channel statistics information of the wireless LAN connection history information may be generated or updated not only when the terminal device 100 is connected to the wireless LAN but also when the external terminal device 310 is connected to the wireless LAN.
  • the external server 320 manages the wireless LAN connection history information, and transmits the wireless LAN connection history information to the terminal device 100 or the external terminal device 310 according to a request from the terminal device 100 or the external terminal device 310.
  • the external server 320 receives information for updating the wireless LAN connection history information from the terminal device 100 or the external terminal device 310.
  • the information received from the terminal device 100 or the external terminal device 310 may include at least one of location information, channel identification information, wireless LAN connection established time, and duration time of wireless LAN connection of the terminal device 100 or the external terminal device 310.
  • the external server 320 may update the wireless LAN connection history information using the received information.
  • the external server 320 may transmit the updated wireless LAN connection history information to the terminal device 100 or the external terminal device 310 when the terminal device 100 or the external terminal device 310 requests the wireless LAN connection history information to access the wireless LAN.
  • the wireless LAN connection history information of the terminal device 100 or the external terminal device 310 may be stored in a memory of the terminal device 100.
  • the terminal device 100 may request the wireless LAN connection history information of the external terminal device 310 from the external terminal device 310 or the external server 320 in order to update the wireless LAN connection history information stored in the memory of the terminal device 100.
  • the external terminal device 310 receiving the request from the terminal device 100 to provide the wireless LAN connection history information may be present within a certain distance from the terminal device 100 or may be present within the same location unit as the terminal device 100.
  • the external terminal device 310 may be present at such a location as to obtain the same cell ID as that of the terminal device 100.
  • the cell ID represents identification information of a base station. Therefore, different values of the cell ID may be obtained according to base stations to which the terminal devices are connected.
  • FIG. 2 is a flowchart illustrating the channel scanning method according to an embodiment of the present invention.
  • the terminal device 100 detects an access point connectable to the terminal device by scanning a channel.
  • the terminal device 100 is connected to the access point to use the Internet service through the wireless LAN.
  • the terminal device 100 may determine a channel to be scanned in order to be connected to the access point.
  • the terminal device 100 may scan all supportable channels.
  • the terminal device 100 may refer to a wireless LAN profile stored in the terminal device 100 to preferentially scan a channel that is present in the profile.
  • the wireless LAN profile is information about a wireless LAN connection history of the terminal device 100 and may include identification information or authentication information of a wireless LAN having a history of connection.
  • a method of determining, by the terminal device 100, a channel to be scanned will be described in detail with reference to FIGS. 3 and 4.
  • the terminal device 100 may select channels that have not been scanned from among channels determined in step S201.
  • the terminal device 100 may arbitrarily select one of the channels that have not been scanned, or may sequentially select the channels that have not been scanned in an ascending order of frequency.
  • the terminal device 100 is not limited to the above-mentioned methods and may select a channel using various other methods.
  • step S205 the terminal device 100 may select the passive scanning method or the active scanning method to scan a channel selected in step S203.
  • the passive scanning method or the active scanning method may be used to scan a channel in the terminal device 100.
  • the terminal device 100 receives a beacon frame from an access point that uses a channel to be scanned so as to scan the channel.
  • the terminal device 100 transmits a probe request message to the access point through the channel to be scanned, and receives a probe response message from the access point so as to scan the channel.
  • the terminal device 100 may determine whether to perform the passive scanning or the active scanning for each channel to be scanned according to preset configuration information such as a WLAN standard or regional information. For example, in an Android native phone supporting both a 2.4 GHz band and a 5 GHz band, the active scanning may be performed on channels 1-13 of the 2.4 GHz band and channels 36-48 and 149-161 of the 5 GHz band at a period of about 15 seconds. The passive scanning may be performed on the other channels of the 5 GHz band.
  • preset configuration information such as a WLAN standard or regional information. For example, in an Android native phone supporting both a 2.4 GHz band and a 5 GHz band, the active scanning may be performed on channels 1-13 of the 2.4 GHz band and channels 36-48 and 149-161 of the 5 GHz band at a period of about 15 seconds.
  • the passive scanning may be performed on the other channels of the 5 GHz band.
  • the channel scanning method for detecting an accessible access point is not limited to the passive scanning or active scanning method, and thus other various methods may be used to scan a channel.
  • step S207 when passive scanning is performed on a channel selected in step S203, the terminal device 100 receives a beacon frame through the channel selected in step S203.
  • the beacon frame received by the terminal device 100 in step S207 may be periodically broadcast from the access point through the channel selected in step S203.
  • a period of the broadcasting may be, for example, about 100 ms.
  • the beacon frame may include information on the access point from which the beacon frame is broadcast.
  • the beacon frame may include a service set identifier (SSID) of the access point, a time stamp, and period information.
  • the time stamp may include information on a transmission time of the beacon frame.
  • the beacon frame may also include information for determining whether an SSID included in a wireless LAN profile matches the SSID of the access point that has transmitted the beacon frame.
  • step S207 When at least one beacon frame is not received in step S207 through the channel selected in step S203 for a certain period of time, it may be determined whether the scanning has been performed on the channels determined to be scanned, in step S215. When the scanning operation on the determined channels is completed, the process may be finished. When there still remains a channel to be scanned among the determined channels, the terminal device 100 returns to step S203 to repeatedly perform step S203 to step S215.
  • step S205 If the terminal device 100 does not select passive scanning in step S205, active scanning is performed in step S209 on the channel selected in step S203, and the terminal device 100 transmits the probe request message to a specific or arbitrary access point through the channel selected in step S203.
  • the access point that has received the probe request message transmitted in step S209 transmits a probe response message as a response to the probe request message.
  • the terminal device 100 may receive the probe response message for the probe request message transmitted in step S209.
  • the probe response message may be received within about 15 ms after the probe request message is transmitted.
  • the terminal device 100 may receive at least one probe response message.
  • the probe response message may include information on the access point transmitting the probe response message and information for determining whether the SSID included in the wireless LAN profile matches the SSID of the access point.
  • step S211 if at least one probe response message is not received by the terminal device 100 through the channel selected in step S203 for a certain period of time, it may be determined whether scanning has been performed on all the channels determined to be scanned, in step S215. When the scanning operation on all the determined channels is completed, the process may be finished. When there still remains a channel to be scanned among the channels determined in step S201, the terminal device 100 returns to step S203 to repeatedly perform step S203 to step S215.
  • step S211 if at least one probe response message is received, the terminal device 100 may store information in step S213 on access points obtained through the channel scanning using the beacon frame or the probe response message received in step S207 or step S211.
  • FIGS. 3 and 4 are flowcharts illustrating the method for determining a channel to be scanned and for scanning the determined channel, according to an embodiment of the present invention.
  • the terminal device 100 may obtain the wireless LAN connection history information.
  • the wireless LAN connection history information may include wireless LAN connection history information on the terminal device 100 or the external terminal device 310 capable of connecting a wireless LAN and at least one access point.
  • the wireless LAN connection history information may include location information on the terminal device 100 or the external terminal device 310 when the terminal device 100 or the external terminal device 310 is connected to the access point.
  • the location information includes a cell ID of a base station connected to the terminal device 100 or the external terminal device 310, in order to receive mobile communication service.
  • the cell ID of the base station connected to the terminal device 100 or the external terminal device 310 may be included in the wireless LAN connection history information as the location information when the terminal device 100 or the external terminal device 310 is connected to the access point.
  • the wireless LAN connection history information may further include signal strength information of the base station for more precisely providing a location of the terminal device 100 or the external terminal device 310.
  • the location information on the terminal device 100 or the external terminal device 310 in the wireless LAN connection history information is not limited to the cell ID.
  • the location information included in the wireless LAN connection history information may include various information such as an enhanced cell ID and a Location Area Code (LAC), a Routing Area Code (RAC), and a Tracking Area Code (TAC) of a wireless mobile communication system to which the terminal device 100 is connected.
  • LAC Location Area Code
  • RAC Routing Area Code
  • TAC Tracking Area Code
  • the wireless LAN connection history information also includes channel information.
  • the channel information may include at least one of the number of times of connection to the terminal device 100 or the external terminal device 310 for each channel, a duration time of connection to the terminal device 100 or the external terminal device 310 for each channel, and a time of connection to the terminal device 100 or the external terminal device 310 for each channel.
  • the number of times of connection to the terminal device 100 or the external terminal device 310 for each channel represents the number of times of successful connection of the terminal device 100 or the external terminal device 310 to an access point by scanning each channel.
  • the number of times of connection for each channel represents the number of times of providing wireless LAN Internet service to the terminal device 100 or the external terminal device 310 through a connected access point for each channel.
  • the duration time of connection to the terminal device 100 or the external terminal device 310 for each channel represents a time during which connection between the terminal device 100 or the external terminal device 310 and the access point is maintained when the terminal device 100 or the external terminal device 310 scans each channel and is connected to the access point.
  • the duration time of connection for each channel represents a time during which the wireless LAN Internet service is provided to the terminal device 100 or the external terminal device 310 while the connection between the terminal device 100 or the external terminal device 310 and the access point is maintained.
  • the time of connection to the terminal device 100 or the external terminal device 310 for each channel may include a time stamp of a recent time at which the terminal device 100 or the external terminal device 310 has been connected to the access point by scanning each channel.
  • the time of connection for each channel represents a recent time at which the terminal device 100 or the external terminal device 310 has been provided with the wireless LAN Internet service by being connected to the access point. Therefore, the time of connection for each channel may represent a time at which the connection to the access point is released and the wireless LAN Internet service is finished.
  • the channel information included in the wireless LAN connection history information may be divided according to the location information on the terminal device 100 or the external terminal device 310. That is, the channel information may be divided according to the location information obtained when the terminal device 100 or the external terminal device 310 is connected to the access point.
  • step S303 the terminal device 100 determines a channel to be scanned based on the wireless LAN connection history information obtained in step S301.
  • the terminal device 100 may obtain the cell ID of a base station that is currently connected to the terminal device 100 or the channel information corresponding to current location information on the terminal device 100, from the wireless LAN connection history information obtained in step S301.
  • the terminal device 100 may determine a channel to be scanned based on at least one of the number of times of connection, the duration time of connection, and the connection time of a channel at a current location included the obtained channel information. Therefore, according to an embodiment of the present invention, the terminal device 100 may preferentially scan a channel at which an available access point may be highly possibly detectable, based on the wireless LAN connection history information.
  • the terminal device 100 may determine a channel to be scanned based on whether the number of times of connection is large, the duration time of connection is long, and the connection time is recent.
  • the terminal device 100 may determine a priority order of scanning channels that may be scanned using the channel information. For example, the terminal device 100 may determine a channel of which the connection time is most recent as a highest-priority channel and may determine a channel of which the connection time is not recent but of which the connection duration time is long or the number of times of connection is large as a next-highest-priory channel, in order to perform scanning at a next period.
  • the method of prioritizing channels to be scanned is not limited thereto.
  • the priority order may be determined based on the connection duration time or the number of times of connection according to a setting.
  • the terminal device 100 may determine a channel to be scanned based on various types of information without being limited to the above-mentioned channel information.
  • the terminal device 100 may obtain the channel information on a channel able to be scanned at an entire location, from the wireless LAN connection history information obtained in step S301.
  • the obtained channel information may be the channel information on a channel connected to the terminal device 100 at a previous time without consideration of current location information.
  • the terminal device 100 may obtain the channel information from the wireless LAN connection history information without consideration of the current location information on the terminal device 100.
  • the terminal device 100 may determine a channel to be scanned based on the number of times of connection, the connection duration time, and the connection time of a channel of the terminal device 100 using the obtained channel information.
  • Prioritizing channels to be scanned at the entire location may be performed in the same manner as mentioned above with respect to the prioritizing channels to be scanned at a current location.
  • the terminal device 100 may scan the channel determined to be scanned in step S303 using the passive scanning method or the active scanning method. As a result of the scanning, when the terminal device 100 cannot detect an access point or fails in authentication and thus there is no available access point, the terminal device 100 may determine a channel to be scanned again. For example, the terminal device 100 may scan the next-highest-priority channel determined in step S303. Determining a channel to be scanned again and scanning the determined channel may be performed after standing by until a next period begins according to a channel scanning period.
  • Steps S405, S407, and S409 of FIG. 4 correspond to steps S301, S303, and S305 of FIG. 3, respectively.
  • step S401 when the terminal device 100 scans channels, the terminal device 100 may determine whether to perform odd-numbered scanning in order to detect an access point.
  • the terminal device 100 may determine a channel to be scanned in consideration of the wireless LAN connection history information.
  • the terminal device 100 may scan at least one of channels that may be scanned by the terminal device 100, in step S402. For example, the terminal device 100 may scan all channels that may be scanned.
  • the terminal device 100 may perform both a method of preferentially scanning a channel determined based on the wireless LAN connection history information and a method of scanning at least one of all channels that may be scanned by the terminal device 100.
  • a channel to be scanned is determined according to the odd-numbered scanning or the even-numbered scanning.
  • an embodiment of the present invention is not limited thereto, and thus a channel to be scanned may be determined using other methods.
  • the method of scanning at least one channel may be performed once whenever the method of preferentially scanning a channel determined based on the wireless LAN connection history information is performed twice. Therefore, the terminal device 100 may perform various methods for determining a channel and for scanning the determined channel.
  • the terminal device 100 may obtain the current location information on the terminal device 100.
  • the current location information on the terminal device 100 includes the cell ID information on a mobile communication base station to which the terminal device 100 is currently connected.
  • the current location information on the terminal device 100 may include at least one of cell ID information, a Location Area Code (LAC), a Routing Area Code (RAC), and a Tracking Area Code (TAC) of the wireless mobile communication system to which the terminal device 100 is currently connected.
  • LAC Location Area Code
  • RAC Routing Area Code
  • TAC Tracking Area Code
  • the terminal device 100 may obtain the wireless LAN connection history information corresponding to the entire location or the current location.
  • the wireless LAN connection history information for the entire location may include information on at least one channel connectable to the terminal device 100, regardless of the current location of the terminal device 100. That is, the wireless LAN connection history information for the entire location may include the channel information on a channel having a history of wireless LAN connection from among channels connectable to the terminal device 100.
  • the wireless LAN connection history information for the current location may include the channel information on at least one channel which has a history of wireless LAN connection and is able to be connected to the terminal device 100 at the current location of the terminal device 100. That is, the wireless LAN connection history information for the current location may include the channel information on a channel having a history of wireless LAN connection to the terminal device 100 or the external terminal device 310 within the current location. In other words, the wireless LAN connection history information for the current location may include the channel information on a channel used by an access point having a history of wireless LAN connection to the terminal device 100 or the external terminal device 310 within the current location.
  • the channel information may include at least one of the number of times of connection between an arbitrary device and the access point for each channel, the duration time of connection between the arbitrary device and the access point for each channel, and the time of connection between the arbitrary device and the access point for each channel.
  • the arbitrary device may be the terminal device 100 or the external terminal device 310.
  • the wireless LAN connection history information may include the location information on the terminal device 100 when the terminal device 100 is connected to the access point.
  • the location information may include the cell ID of a base station connected to the terminal device 100 for using the mobile communication service. That is, the cell ID of the base station connected to the terminal device 100 may be included in the wireless LAN connection history information as the location information when the terminal device 100 is connected to the access point.
  • the wireless LAN connection history information may further include signal strength information of the base station for more precisely providing a location of the terminal device 100.
  • the location information on the terminal device 100 in the wireless LAN connection history information may include various types of information for providing the location information on the terminal device 100, such as the cell ID, the LAC, the RAC, and the TAC.
  • the wireless LAN connection history information may include the channel information.
  • the channel information may include at least one of the number of times of connection to the terminal device 100 for each channel, the duration time of connection to the terminal device 100 for each channel, and the time of most recent connection to the terminal device 100 for each channel.
  • the number of times of connection to the terminal device 100 for each channel may represent the number of times of providing the wireless LAN internet service to the terminal device 100 through a connected access point for each channel.
  • the duration time of connection to the terminal device 100 for each channel may represent the duration time of providing the wireless LAN internet service to the terminal device 100 while the connection to the access point is maintained for each channel.
  • the time of most recent connection to the terminal device 100 may include a time stamp of a most recent time at which the terminal device 100 has been connected to the access point for each channel.
  • the wireless LAN connection history information may not be limited to information corresponding to the current location of the terminal device 100, and may information corresponding to the entire location regardless of the current location of the terminal device 100. That is, the wireless LAN connection history information may include the channel information on a channel having a history of wireless LAN connection at the entire location from among channels connectable to the terminal device 100.
  • the terminal device 100 may determine a channel to be scanned based on the wireless LAN connection history information. As described above, the terminal device 100 may determine a channel to be scanned based on the number of times of connection, the connection duration time, and the connection time of a channel at the current location of the terminal device 100 or the entire location using the channel information obtained in step S405.
  • the method of determining whether to determine a channel to be scanned in consideration of the channel information for the current location, or to determine a channel to be scanned in consideration of the channel information for the entire location is not limited thereto, and thus various other methods may be used.
  • the terminal device 100 determines at least one channel to be scanned, may also determine a priority order of scanning channels based on the wireless LAN connection history information.
  • the terminal device 100 may scan the channels determined in step S407.
  • the terminal device 100 may perform the passive scanning or the active scanning according to a channel.
  • the terminal device 100 may determine whether to perform the passive scanning or the active scanning according to the WLAN standard or preset configuration information and a channel to be scanned.
  • the terminal device 100 may scan the determined channels according to the priority order in step S409.
  • the channel scanning may be performed periodically.
  • step S411 the terminal device 100 may determine an access point to be connected thereto as a result of the channel scanning in steps S402 or S409.
  • step S411 if the terminal device 100 cannot detect the access point or fails in authentication and thus fails connect to the access point as a result of the channel scanning, the terminal device 100 may stand by until a next scanning period begins in step S413, and then returns to step S401 to determine a channel to be scanned again.
  • the terminal device 100 may perform connection to the determined access point in step S417 so as to use the Internet service through the wireless LAN.
  • the terminal device 100 may perform authentication, and may be connected to the access point when the authentication is successful.
  • the terminal device 100 may perform the authentication for the access point using a password stored in the wireless LAN profile or a password input by a user.
  • the terminal device 100 may return to operation S413, may stand by until a next scanning period begins, and may repeat a channel scanning procedure. Alternatively, the terminal device 100 may request the user to input the password again.
  • the terminal device 100 may update the wireless LAN connection history information in step S419.
  • the terminal device 100 may update the channel information that may be included in the wireless LAN connection history information.
  • the terminal device 100 may increase the number of times of connection to the channel used by the currently connected access point by as much as one, to update the channel information on the current location of the terminal device 100.
  • the terminal device 100 may update the time of recent connection to the channel used by the currently connected access point with the time at which the connection to the currently connected access point is released after being established.
  • the terminal device 100 may measure the duration time of connection to the currently connected access point and may update the connection duration time of the channel used by the currently connected access point with a measured value. For example, the connection duration time of the channel may be updated with an average value of measured connection duration times.
  • step S419 when the terminal device 100 stores the wireless LAN connection history information in the memory of the terminal device 100, the wireless LAN connection history information stored in the memory is updated.
  • information for updating the wireless LAN connection history information may be transmitted to the external server 320.
  • the information transmitted to the external server 320 includes at least one of the current location information on the terminal device 100, the identification information on the currently connected channel, the time at which the connection between the current channel and the access point has been established, and the duration time of connection to the currently connected access point.
  • the external server 320 may update the wireless LAN connection history information using the received information.
  • FIG. 5 is a diagram illustrating an example of the wireless LAN connection history information in a location Cell_ID_a according to an embodiment of the present invention.
  • the wireless LAN connection history information in the location Cell_ID_a may include the channel information used when the terminal device 100 is connected to the access point.
  • the wireless LAN connection history information may include the number of times of connection, the connection duration time, and the connection time for each channel, and may be divided according to a location of the terminal device 100 on which wireless LAN connection has been performed.
  • FIGs. 6A and 6B are block diagrams illustrating an inner structure of a terminal device for performing the channel scanning method according to an embodiment of the present invention.
  • a terminal device 600 may include a controller 610 and a communicator 620. However, the terminal device 600 may include more elements or may include less elements than the illustrated elements.
  • the controller 610 may control the overall operation of the terminal device 600.
  • the controller 610 performs control and process related to connection to a wireless LAN, such as the channel scanning method for the wireless LAN connection described above with reference to FIGS. 2 to 4. That is, the controller 610 controls the overall operation of communicator 620.
  • the controller 610 obtains wireless LAN connection history information and determines a channel to be scanned based on the wireless LAN connection history information.
  • the controller 610 determines an access point to be connected to the terminal device 600 based on a result of scanning, by the communicator 620.
  • the controller 610 may also obtain the wireless LAN connection history information corresponding to location information obtained by the communicator 620.
  • the controller 610 stores the wireless LAN connection history information based on information on the access point connected to the terminal device 600.
  • the communicator 620 may include at least one element enabling communication between the terminal device 600 and the wireless LAN environment 200.
  • the communicator 620 may include a mobile communication module, a wireless LAN module, and a short-range communication module.
  • the mobile communication module transmits/receives radio signals to/from at least one of a base station, an external terminal, and a server on a mobile communication network.
  • the radio signal may include various types of data according to transmission of a voice call signal, a video call signal, or character/multimedia messages.
  • the wireless LAN module represents a module for wireless LAN connection and may be internally or externally included in the terminal.
  • the short-range communication module represents a module for short-range communication.
  • a short-range communication technology such as Bluetooth, Radio Frequency IDentification (RFID), Infrared Data Association (IrDA), Ultra WideBand (UWB), or ZigBee may be used.
  • the communicator 620 When the communicator 620 is connected to a base station transmitting/receiving radio signals, the communicator 620 may receive cell ID information on the base station from the base station so as to obtain location information on the terminal device 600.
  • the communicator 620 scans a channel based on a channel determined by the controller 610, or may scan a channel able to be scanned by the terminal device 600, by performing at least one of the active scanning and the passive scanning methods, and may be connected to the access point determined by the controller 610.
  • the terminal device 600 may include the controller 610, the communicator 620, a memory 630, a user input 640, and a display 650.
  • the terminal device 600 may include more elements or may include less elements than the illustrated elements.
  • the controller 610 and the communicator 620 of FIG. 6B correspond to the controller 610 and the communicator 620 of FIG. 6A.
  • the memory 630 may store a program for the process and control of the controller 610 and may store input/output data (e.g., captured data, phonebook, message, still image, video, etc).
  • input/output data e.g., captured data, phonebook, message, still image, video, etc.
  • the memory 630 may include at least one of storage media such as a flash memory, a hard disk, a multimedia card micro, a card-type memory (e.g. SD or XD memory), a random access memory (RAM), a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), a programmable read-only memory (PROM), a magnetic memory, a magnetic disk, and an optical disk.
  • the terminal device 600 may operate web storage for performing a storage function of the memory 630 on the Internet.
  • the memory 630 stores the wireless LAN connection history information used to scan a channel.
  • the user input 640 generates input data for controlling the terminal device 600.
  • the user input 640 may include a keypad, a dome switch, a touchpad (resistive/capacitive type), a jog wheel, a jog switch, and a button.
  • the touchpad forms a layered structure together with the display 650, this structure may be referred to as a touch screen.
  • the user input 640 may receive a wireless LAN connection request or a password for authentication from a user.
  • the display 650 displays and outputs information processed in the terminal device 600.
  • the display 650 may display a list of access points connectable to the terminal device 600 and a UI and a GUI related to an authentication procedure for performing connection to an access point.
  • the display 650 may be used not only as an output device but also an input device.
  • the display 650 includes at least one of a Liquid Crystal Display (LCD), a Thin Film Transistor-Liquid Crystal Display (TFT-LCD), an Organic Light-Emitting Diode (OLED), a flexible display, and a 3D display.
  • LCD Liquid Crystal Display
  • TFT-LCD Thin Film Transistor-Liquid Crystal Display
  • OLED Organic Light-Emitting Diode
  • a type of the terminal device 600 two or more displays 650 may be provided.
  • the touch screen may be configured so as to detect not only a location and an area of a touch but also pressure of the touch.
  • the touch screen may be configured so as to detect not only a real touch but also a proximity or a hovering touch.
  • the real touch represents a case where an input device such as a pointer actually touches a screen
  • the proximity touch represents a case where the pointer does not actually touches the screen but approaches the screen within a certain distance.
  • the pointer represents a tool for touching a part of the screen or proximately touching the screen.
  • the pointer may include a stylus pen and a finger.
  • an access point connectable to the terminal device 100 or 600 may be rapidly detected.
  • a channel for detecting an access point that is highly possibly connectable to the terminal device 100 or 600 at a current location may be preferentially scanned.
  • the method according to an embodiment of the present invention may be implemented as a code on a recording medium readable by a computer (including devices having a function of information processing).
  • the computer-readable recording medium includes any type of a recording device for storing data readably by a computer system.
  • the computer-readable recording medium includes a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.

Abstract

L'invention concerne un procédé et un dispositif de terminal pour balayer un canal. Selon le procédé, des informations d'historique de connexions à un réseau local (LAN) sans fil sont obtenues, un canal à balayer est déterminé sur la base des informations d'historique de connexions à un LAN sans fil, et un canal est balayé sur la base du canal déterminé.
PCT/KR2014/008276 2013-09-03 2014-09-03 Procédé et appareil pour balayer un canal WO2015034264A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2013-0105726 2013-09-03
KR20130105726 2013-09-03
KR10-2013-0115722 2013-09-27
KR20130115722A KR20150026672A (ko) 2013-09-03 2013-09-27 채널을 스캔하는 방법 및 장치

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WO (1) WO2015034264A1 (fr)

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JP6359852B2 (ja) * 2014-03-27 2018-07-18 Ｎｅｃプラットフォームズ株式会社 無線ｌａｎ装置、端末および方法
US10334507B2 (en) * 2015-08-19 2019-06-25 Microsoft Technology Licensing, Llc Opportunistic use of spectrum
US11172377B2 (en) * 2019-11-27 2021-11-09 Verizon Patent And Licensing Inc. Systems and methods for radio beam management for a wireless network
CN114071653A (zh) * 2020-07-29 2022-02-18 阿里巴巴集团控股有限公司 网关设备、路由器扫描方法及装置、电子设备
CN113438711B (zh) * 2021-05-21 2024-04-12 珠海全志科技股份有限公司 一种Wi-Fi连接的控制方法及装置
EP4099638A1 (fr) * 2021-06-02 2022-12-07 Siemens Aktiengesellschaft N ud de réseau, système et procédé de collecte d'informations de connexion

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